Continuing Education
Digital and Analog Troubleshooting
Tools and techniques to help the technician find faults in circuits, signals and drives Physical quantities can be represented by numerical values in either analog or digital. The analog method...
Elevator Door Force
Maladjustment of elevator door controllers can cause injury to persons if impacted by a closing door with a high speed. Persons can also be entrapped or crushed by a door...
Working with JFETs
Details on and how to deal with junction field-effect transistors (JFETs) on the job JFETS are composed of N- and P-type crystalline silicon layers that have been doped. The underlying...
Motor Controllers
Types, requirements, and diagnostics and repair are among the aspects of motor controllers this overview addresses. The National Electrical Code (NEC), which has jurisdiction over subjects in which it has...
Lubrication and Elevator Ropes: Myths, Half Truths and Mistruths
An examination of a key component to rope life and rope performance by Martin Rhiner and Heinz Studiger There is an old saying that bears repeating when discussing elevator rope...
Elevator Hoistway Doors
Failures of door guiding means and door safety retainers on horizontally sliding doors can cause catastrophic injury to someone falling through a hoistway door into the hoistway when the elevator...
Integrated Circuits
The history, application and maintenance of these important microelectronics components are explored. In the microelectronics continuum, integrated circuits (ICs) are probably close to their midpoint of development. They have progressed...
Voltage Sags
How these phenomena affect the elevator industry and steps that can be taken to mitigate their effects by Dr. Albert So and Dr. W.L. Chan Your authors were first inspired...
What Is a Transistor?
Another major electronic component used in elevators is detailed. Like diodes, transistors are major players in the electronics arena, notably in elevator motion controllers and variable-frequency drives (VFDs) that have...
MOSFETs
This article on metal-oxide semiconductor field-effect transistors (MOSFETs) builds on lessons from the prior piece “What Is a Diode?” (ELEVATOR WORLD, August 2014). Metal-oxide semiconductor field-effect transistors (MOSFETs) are similar...
